Make TinyURL-like URLs (you.com/33ks8s) that redirect to pages inside / outside your blog. Can also create human-readable aliases (you.com/facebook).

Noted That:

To install correctly this link-shortcut.zip.
Fisrt Download the link-shortcut.zip to your computer
Extract/Open link-shortcut.zip to Your Computer.
Then, Find readme.txt file inside link-shortcut.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "link-shortcut.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "link-shortcut.zip" Downloaded plugin from your computer, Where you downloaded link-shortcut.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Link Shortcut" folder is added on left sidemenu. Now, Click on "Link Shortcut" folder.

Noted that: If you do not see "Link Shortcut" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Link Shortcut Configurtions and Settings or How to work "Link Shortcut" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "Link Shortcut" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Link Shortcut
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
Upload the Link Shortcut plugin to your blog (YOURBLOG/wp-content/plugins) and activate it using the WordPress plugin admin screen. Click “Link Shortcuts” in the left-hand menu and manage your links. IMPORTANT: Deactivating 1.2 and lower before upgrading to 1.3 will result in loss of any links you’ve created with this plugin. If you’d like to keep that data, simply replace the plugin files with the new version — but be aware of the following: There has been a database change to enable you to set a longer character length. If you want that new functionality, you’ll need to make manual edits to your DB structure to enable this (change wp_linkshortcut.ident’s field type to VARCHAR(255)). If you don’t want to make manual edits but would like the new features, you’ll have to bite the bullet and deactivate / unzip / re-activate. Sorry.

Guide

Upload the Link Shortcut plugin to your blog (YOURBLOG/wp-content/plugins) and activate it using the WordPress plugin admin screen.
Click “Link Shortcuts” in the left-hand menu and manage your links.

IMPORTANT: Deactivating 1.2 and lower before upgrading to 1.3 will result in loss of any links you’ve created with this plugin. If you’d like to keep that data, simply replace the plugin files with the new version — but be aware of the following: There has been a database change to enable you to set a longer character length. If you want that new functionality, you’ll need to make manual edits to your DB structure to enable this (change wp_linkshortcut.ident’s field type to VARCHAR(255)). If you don’t want to make manual edits but would like the new features, you’ll have to bite the bullet and deactivate / unzip / re-activate. Sorry.

create, also, blogcan, human, readable, youcomfacebook, aliases, your, outside, urls,

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Reffered: https://wordpress.org/